Kennametal 4042940 Sppxmd KCU40 Carbide Drill Insert

Product Description

The KENNAMETAL 4042940 is a solid carbide indexable drill insert in the SPPX style with an MD chipbreaker geometry, designed for use in indexable insert drills on CNC machining centers and drilling operations. The insert carries a PVD-applied dual-layer TiN and TiAlN coating that supports heat resistance and wear performance in a range of workpiece materials. With an inscribed circle of 0.494 inches and a corner radius of 0.0469 inches, this insert is suited for precision-diameter drilling applications. Installation and replacement are performed by machinists and tooling technicians as part of routine insert indexing on compatible drill bodies.

This insert is applicable to production drilling operations in job shops, aerospace, automotive, and general metalworking environments. The SPPX insert style and MD chipbreaker are configured for controlled chip formation in materials including steel and cast iron. The manufacturer grade KCU40 indicates a carbide substrate and coating formulation optimized for demanding cutting conditions. The insert size designation is 120412, and the hole diameter measures 0.1811 inches, which determines the compatible screw or mounting system on the drill body.

Key Features

• SPPX insert style with MD chipbreaker geometry for controlled chip evacuation
• PVD-coated with TiN and TiAlN dual-layer finish for wear and heat resistance
• Solid carbide substrate under manufacturer grade KCU40
• Inscribed circle of 0.494 inches with a 0.0469-inch corner radius
• Mounting hole diameter of 0.1811 inches for screw-on insert seating
• Insert size designation 120412 for drill body cross-reference

Compatibility

Designed as an OEM-style replacement insert for indexable drill bodies accepting SPPX-style inserts with a 120412 size designation and a 0.1811-inch mounting hole diameter. Verify drill body insert pocket specifications before installation.

Installation Notes

Insert indexing and replacement should be performed by qualified machinists or tooling technicians with the machine powered down and locked out per applicable OSHA lockout/tagout procedures. Use the correct torx or hex key specified by the drill body manufacturer to seat the insert at the proper clamp torque — do not overtighten or use impact tools on insert screws. Inspect the insert pocket for debris or damage before seating a new insert. Confirm insert orientation matches the chipbreaker direction required by the drilling application.